The answer is to export the VPC ID and subnet IDs from the network stack using the Export field and import them in the application stack with Fn::ImportValue. This is correct because CloudFormation cross-stack reference exports provide a native, decoupled way to share resource attributes between stacks without hardcoding values or creating circular dependencies. The Export field makes a stack output available to other stacks in the same account and region, while Fn::ImportValue retrieves that exported value at deployment time, ensuring that updates to the network stack automatically propagate to dependent stacks. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of infrastructure-as-code best practices for multi-team environments, often appearing in scenarios where you must avoid manual parameter passing or nested stacks. A common trap is trying to use Parameters or hardcoded values instead of exports, which breaks automation and creates drift. Memory tip: think "Export to share, ImportValue to care" — exports are the only way to share outputs across independently managed stacks.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses AWS CloudFormation to deploy a multi-tier application. The network team manages the VPC and subnets using a separate CloudFormation stack. The application team needs to reference the VPC ID and subnet IDs from the network stack. Which approach should the application team use to obtain these values?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Export the VPC ID and subnet IDs from the network stack using the 'Export' field and import them in the application stack using Fn::ImportValue.
Option B is correct because CloudFormation's Export and Fn::ImportValue mechanism allows cross-stack references without hardcoding or duplicating values. The network stack exports the VPC ID and subnet IDs using the Export field, and the application stack imports them via Fn::ImportValue, ensuring that changes in the network stack propagate automatically to dependent stacks.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Hardcode the VPC and subnet IDs in the application template.
Why it's wrong here
Hardcoding reduces flexibility and maintainability.
✓
Export the VPC ID and subnet IDs from the network stack using the 'Export' field and import them in the application stack using Fn::ImportValue.
Why this is correct
Cross-stack references allow sharing outputs between independent stacks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create the network stack as a nested stack inside the application stack.
Why it's wrong here
Nested stacks create a dependency that may not be desired; they also complicate updates.
✗
Store the VPC and subnet IDs in AWS Systems Manager Parameter Store and retrieve them using dynamic references.
Why it's wrong here
While possible, cross-stack references are simpler and more idiomatic for CloudFormation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse cross-stack references with nested stacks or parameter stores, but the exam specifically tests the Export/ImportValue pattern for decoupled stacks managed by different teams.
Detailed technical explanation
How to think about this question
Under the hood, Fn::ImportValue resolves the exported output from another stack within the same AWS account and region, and CloudFormation maintains a dependency graph that prevents deletion of the exporting stack while imports exist. A subtle behavior is that exported values must have unique names across all stacks in a region, and if the exporting stack is updated, the importing stack must be updated to reflect the new value, but this is still more maintainable than hardcoding. In a real-world scenario, this pattern is critical for large enterprises where network and application teams operate independently, as it enforces a clear separation of concerns while enabling automated cross-stack references.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Export the VPC ID and subnet IDs from the network stack using the 'Export' field and import them in the application stack using Fn::ImportValue. — Option B is correct because CloudFormation's Export and Fn::ImportValue mechanism allows cross-stack references without hardcoding or duplicating values. The network stack exports the VPC ID and subnet IDs using the Export field, and the application stack imports them via Fn::ImportValue, ensuring that changes in the network stack propagate automatically to dependent stacks.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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